Math CentralQuandaries & Queries


Question from Izayah, a student:

what is 3 ways to find the meeting point of y=2x+4 and 3x+y=7 by making 2 table and using a graph

Hi Izayah.

If y = 2x + 4, then anywhere you see "y", you can write "2x + 4" instead, right? They are equal, after all.

Actually, it is always a good idea to use extra parentheses in these cases, so you should use "(2x + 4)".

Now, if 3x + y = 7, what do you get when you substitute for (2x + 4) in place of the y? Can you find the value of x? With that, can you find the corresponding value of y?

Hope this helps,
Stephen La Rocque.

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